-Helium is the second most abundant element in the universe.
-In 1928 Helium became available for the first time on the open market.
-Helium is so light that earth's gravity is not strong enough to hold on to it. When Helium atoms are released into the atmosphere, they rise until they escape into space.
-At temperatures close to absolute zero, helium condenses to a liquid with amazing properties - the properties of a super fluid, flowing with zero friction up and over the walls of containers.
-Helium exists in Earth’s atmosphere only because it is constantly resupplied from two sources – decay of radioactive elements on Earth, and cosmic rays, about 9% of which are high energy helium nuclei.
-The helium we buy in cylinders is produced by the natural radioactive decay of radioactive elements in the earth’s crust – principally thorium and uranium.
Atomic Number
2Atomic Mass
4.00Number of ... Protons
2Electrons
2Neutrons
2Period Number
1Group Number
18Group Name
Noble GasMelting Point
0.95 KBoiling Point
4.22 KState
GasDensity
0.0001785 grams per cubic centimeterNon Metal
Color of Element
ColorlessWho discovered it ?
Norman Lockyer, Pierre Jules Cesar , JanssenWhen
1868Where
The sunHow
Studying a solar EclipseFlammable?
NoInteresting Facts
-Helium is the second most abundant element in the universe.-In 1928 Helium became available for the first time on the open market.
-Helium is so light that earth's gravity is not strong enough to hold on to it. When Helium atoms are released into the atmosphere, they rise until they escape into space.
-At temperatures close to absolute zero, helium condenses to a liquid with amazing properties - the properties of a super fluid, flowing with zero friction up and over the walls of containers.
-Helium exists in Earth’s atmosphere only because it is constantly resupplied from two sources – decay of radioactive elements on Earth, and cosmic rays, about 9% of which are high energy helium nuclei.
-The helium we buy in cylinders is produced by the natural radioactive decay of radioactive elements in the earth’s crust – principally thorium and uranium.
Reaction with other things
Helium does not react with anything else.
LINKS
Jlab
Chemical Elements
Universe Today
Wikipedia
Chemicool